java 浮点数（或双精度数）可以设置为 NaN 吗？
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Can float (or double) be set to NaN?
提问by ahodder
Note: Similar to Can an integer be NaN in C++?
注意：类似于C++ 中的整数可以是 NaN 吗？
I understand this has little practical purpose, but can a floator doublebe set to NaN?
我知道这几乎没有实际用途，但是可以将 afloat或double设置为NaN吗？
采纳答案by Codemwnci
The Float object contains a static value, which is a floattype, called NaN.
Float 对象包含一个静态值，它是一种float类型，称为NaN。
So
所以
float myFloat = Float.NaN;
gives you what you are asking.
给你你所要求的。
http://download.oracle.com/javase/6/docs/api/java/lang/Float.html#NaN
http://download.oracle.com/javase/6/docs/api/java/lang/Float.html#NaN
回答by japreiss
Sure! NaN is a static constant in the Float and Double classes.
当然！NaN 是 Float 和 Double 类中的静态常量。
double x = Double.NaN;
回答by Brian Agnew
Yes
是的
float f = Float.NaN;
See the docfor more info. Note that if you want to compare a number to NaN, you should use isNan().
有关更多信息，请参阅文档。请注意，如果要将数字与 NaN 进行比较，则应使用isNan()。
Despite your question above, this does have a practical purpose. You can use this to indicate a value hasn't been set/provided yet.
尽管您提出了上述问题，但这确实有实际用途。您可以使用它来指示尚未设置/提供的值。
